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March 3rd, 2010, 12:57 PM  #1 
Newbie Joined: Mar 2010 Posts: 1 Thanks: 0  Is this possible?
Hi all. Is it possible to find the point [x,y] if I know all the other variables on this diagram ([a,b], [c,d], length 1, length 2 and length 3)... It's been quite a long time since I studied Maths so any help would be massively appreciated. It's to solve some Javascript code in some animation in case you're interested or if it helps to find a solution. Thanks, JimJam http://www.jimjamgraphics.com/ 
March 3rd, 2010, 03:13 PM  #2  
Senior Member Joined: Mar 2007 Posts: 428 Thanks: 0  Re: Is this possible? Quote:
l3 is redundant, as it is determined by the given coordinates. Neat way to throw in a bit of advertising by the way.  
March 4th, 2010, 08:29 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,931 Thanks: 2205 
It's length 1 that is redundant. The point (x, y) could lie on either side of the line joining the given points, so a little extra information is needed to reduce the two possibilities to just one.

March 4th, 2010, 09:14 AM  #4  
Senior Member Joined: Mar 2007 Posts: 428 Thanks: 0  Re: Quote:
 
March 4th, 2010, 10:07 AM  #5  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Is this possible? Hello, JimJam! Quote:
You should redraw the diagram . . . The point are collinear. Code: (a,b) (c,d) (x,y) *** :  1  :    2    : :      3      :  
March 4th, 2010, 04:56 PM  #6 
Global Moderator Joined: Dec 2006 Posts: 20,931 Thanks: 2205 
That interpretation may be too literal. I interpreted "length 1" as meaning "variable 1", etc., so that the three lengths are given by three variables.
